Any outside objects left within SCP-3347-2 will disappear during Transposition Shifts, making surveillance of the transposition process via security cameras impossible.

You say this, but later on state that "The[…] windows of SCP-3347-2 were unbroken[…]", meaning that you should just be able to put security cameras outside the house looking into the room. Outside from that, I can't really say much other than it didn't click for me personally.

PS: You might want to remove the tags that you added yourself, since the tagging team is unable to see articles that are tagged, and I'm pretty sure that you didn't use all the correct tags.

Dr. Lavinson spent the entirety of the day within SCP-3347-2. Dr. Morris entered SCP-3347-2 at around 10:30 PM and found Dr. Morris talking in a jovial manner to a nonexistent entity. Attempts to persuade Dr. Lavinson to leave SCP-3347-2 were unsuccessful.

Should probably be:

Dr. Lavinson spent the entirety of the day within SCP-3347-2. Dr. Morris entered SCP-3347-2 at around 10:30 PM and found Dr. Lavinson talking in a jovial manner to a nonexistent entity. Attempts to persuade Dr. Lavinson to leave SCP-3347-2 were unsuccessful.

Small point: The use of dresser drawer here is incorrect unless you're telling us that a single unlidded box appeared without any supporting structure. "Dresser" or "chest of drawers" is what I suspect you were shooting for.